This segment from Evolution: "Why Sex? Although they are close relatives, chimps and bonobos have strikingly different social dynamics: chimps society is prone to violence, and bonobos are relatively peaceful. One theory suggests that a small change in the availability of food may have encouraged the evolution of today's chimp and bonobo societies. Researchers Richard Wrangham and Amy Parish comment on the group dynamics of the two species. All rights reserved. View in: QuickTime RealPlayer.
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By Colin Barras. Humans, meanwhile, show a variety of mating behaviours but often form monogamous couples. Michael Jensen-Seaman and Scott Hergenrother at Duquesne University in Pennsylvania think that it is the chimps — not humans — that have experimented with new sexual behaviours since our lineages diverged. But did male chimps inherit their mating plugs from the last common ancestor they shared with us or did they evolve it later? They found that the enzyme is four times as abundant in human semen as it is in chimp semen.
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Terry Gross. A chimpanzee hugs her newborn at Burgers' Zoo in Arnhem, Netherlands, in Over the course of his long career, primatologist Frans de Waal has become convinced that primates and other animals express emotions similar to human emotions. When Frans de Waal started studying nonhuman primates, in the Netherlands more than 40 years ago, he was told not to consider the emotions of the animals he was observing. But over the course of his career, de Waal became convinced that primates and other animals express emotions similar to human emotions.
We often look to the behavior of chimpanzees and bonobos to infer the behavior of our ancestors. For example, male coalitionary aggression in chimpanzees is often taken to indicate violent tendencies in humans. Comparative data on bonobos provide a different picture that emphasizes peace and non-violence. However, both species have similar social structures. Males reside in the group their entire lives, females typically disperse and must integrate into a new community, and both have highly flexible, fission-fusion dynamics, in which animals join subgroups that frequently change.